55results about How to "Cause leakage" patented technology

The application discloses a PDF format document encryption method and device and a storage medium, which comprises the following steps: obtaining an initial document and a segmentation parameter, wherein the initial document is a PDF format document; performing data segmentation processing on the initial document based on the segmentation parameter, segmenting data in the initial document into N data blocks, obtaining data block B1, data block B2,..., and data block B N N; wherein N>3; performing reordering processing on the N data blocks, saving the data blocks according to a random ordering result after random ordering of the N data blocks, and generating a reordered document; performing secondary segmentation processing on the reordered document, generating a first encrypted document and a second encrypted document; and sending the first encrypted document to a server and outputting the second encrypted document to a specified path. The PDF format document encryption method improves the security of the PDF format document by combining data segmentation processing, reordering and secondary segmentation.